Asteroids may be colliding with Earth more frequently than scientists had thought (Posted 2013-11-07 04:29:21): New analysis of Chelyabinsk event in Russia says asteroid hit with energy of 30-plus Hiroshima atom bombs

Achenbach, Joel

The Washington post (Washington, D.C. 1974. Online), 2013-01-01

Washington, D.C: WP Company LLC d/b/a The Washington Post

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